G1000 NXi System Maintenance Manual
Page 309
King Air 300 Series
Revision 1
190-00716-N1
Table 7-10, Required GRS/GMU Calibrations
Condition
Calibrations Required
Procedure A1:
GSU 75B,
GRS 77, or
GRS 7800
Pitch/Roll
Offset
Procedure B:
GSU/GRS/GMU
Magnetic
Calibration
Procedure D:
Engine Run-up
Vibration
Test
Either GMU 44 was removed and
reinstalled. (no change in serial number)
None Required.
Continue to GSU/GRS/GMU Test Section.
GMU 44 was replaced with new unit.
(New serial number)
X
GRS AHRS or GSU ADAHRS was removed
and/or replaced. The mounting tray was
NOT removed and the mounting tray bolts
were NOT loosened.
None Required.
Continue to GSU/GRS/GMU Test Section.
GRS AHRS or GSU ADAHRS was removed
and/or replaced. The mounting tray WAS
removed and/or mounting tray bolts WERE
loosened.
X
X
X
GRS AHRS or GSU ADAHRS Configuration
Module was replaced.
X
X
X
Procedure A1: GSU 75B, GRS 77, or GRS 7800 Pitch/Roll Offset
Calibration
This procedure must be performed for both GSU/GRS units installed in the aircraft. This first
procedure must be carried out with the engine off.
1. Level the aircraft to within
±
0.25° of zero pitch and zero roll using a digital level. (Follow
instructions in King Air 300 Series Maintenance Manual, listed in Table 1-1, for leveling)
2. Start PFD 1 in Configuration mode.
3. Go to the GRS Page Group and select the GRS/GMU Calibration page at the PFD. This
page is protected and the following softkey password must be entered at the PFD to
continue:
•
9
•
10
•
11
•
12 (Far Right softkey)